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Trailblazer 301G intermittent arc welding

Does Miller sell Service manual for this unit? Can someone help with troubleshooting this unit. It welds Intermittently. When it welds, it works great. The Generator works with no problems. We have cleaned the slip rings. We have made sure no ring is common to the shaft. Brushes make good contact and are clean and good shape. We have already replaced Control PC 2. Any help troubleshooting is appreciated. Thanks.